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Give detail description on Transactions.
- Using transactions we can group all SQL commands into a single unit.
- Transaction begins with some task and finishes only when all tasks within it are over.
- Transaction gets over successfully only when all commands in it are successfully over. Even if one command fails, whole transaction fails.
- BEGIN TRANSACTION, ROLLBACK TRANSACTION, and COMMIT TRANSACTION statements are used to work with transactions.
- A group of tasks starts with begin statement.
- Just in case of any problem, rollback command is executed to abort transaction.
- If all tasks run successfully, all commands are executed through commit statement.
Software failures : In such cases, a software error abruptly stops the implementation of the current transaction (or all transactions), therefore leading to losing the state of pr
How does Tuple-oriented relational calculus vary from domain-oriented relational calculus? The tuple-oriented calculus uses a tuple variables i.e., variable whose only allowed
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
For every n-ary relationship type R where n>2, we make a new table S to represent R. We contain as foreign key attributes in s the primary keys of the relations that show the parti
In E-R diagram how generalization is represented? in E-R diagram generalization is represented by Triangle shape.
What is a database graph? The partial ordering implies that the set D may now be viewed as a directed acyclic graph, known as a database graph.
sir we want er diagram of bank management system in this main menu option as new account,deposit amount,withdraw amount,all acount holder list,modify account,close account
Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566
Problem: You are given the following schema 1. Flights(flno, from, to, distance) 2. Aircraft(aid, flno, aname, cruisingRange) 3. Certified(eid, aid) 4. Employees(eid, ena
Type of database technology
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